730 lines
17 KiB
Go
730 lines
17 KiB
Go
package encryption
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import (
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"crypto/ecdsa"
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"database/sql"
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"strings"
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dr "github.com/status-im/doubleratchet"
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"github.com/status-im/status-go/eth-node/crypto"
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"github.com/status-im/status-go/protocol/encryption/multidevice"
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)
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// RatchetInfo holds the current ratchet state.
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type RatchetInfo struct {
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ID []byte
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Sk []byte
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PrivateKey []byte
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PublicKey []byte
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Identity []byte
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BundleID []byte
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EphemeralKey []byte
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InstallationID string
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}
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// A safe max number of rows.
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const maxNumberOfRows = 100000000
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type sqlitePersistence struct {
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DB *sql.DB
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keysStorage dr.KeysStorage
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sessionStorage dr.SessionStorage
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}
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func newSQLitePersistence(db *sql.DB) *sqlitePersistence {
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return &sqlitePersistence{
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DB: db,
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keysStorage: newSQLiteKeysStorage(db),
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sessionStorage: newSQLiteSessionStorage(db),
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}
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}
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// GetKeysStorage returns the associated double ratchet KeysStorage object
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func (s *sqlitePersistence) KeysStorage() dr.KeysStorage {
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return s.keysStorage
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}
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// GetSessionStorage returns the associated double ratchet SessionStorage object
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func (s *sqlitePersistence) SessionStorage() dr.SessionStorage {
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return s.sessionStorage
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}
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// AddPrivateBundle adds the specified BundleContainer to the database
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func (s *sqlitePersistence) AddPrivateBundle(bc *BundleContainer) error {
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tx, err := s.DB.Begin()
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if err != nil {
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return err
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}
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for installationID, signedPreKey := range bc.GetBundle().GetSignedPreKeys() {
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var version uint32
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stmt, err := tx.Prepare(`SELECT version
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FROM bundles
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WHERE installation_id = ? AND identity = ?
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ORDER BY version DESC
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LIMIT 1`)
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if err != nil {
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return err
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}
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defer stmt.Close()
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err = stmt.QueryRow(installationID, bc.GetBundle().GetIdentity()).Scan(&version)
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if err != nil && err != sql.ErrNoRows {
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return err
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}
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stmt, err = tx.Prepare(`INSERT INTO bundles(identity, private_key, signed_pre_key, installation_id, version, timestamp)
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VALUES(?, ?, ?, ?, ?, ?)`)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec(
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bc.GetBundle().GetIdentity(),
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bc.GetPrivateSignedPreKey(),
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signedPreKey.GetSignedPreKey(),
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installationID,
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version+1,
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bc.GetBundle().GetTimestamp(),
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)
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if err != nil {
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_ = tx.Rollback()
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return err
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}
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}
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if err := tx.Commit(); err != nil {
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_ = tx.Rollback()
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return err
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}
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return nil
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}
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// AddPublicBundle adds the specified Bundle to the database
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func (s *sqlitePersistence) AddPublicBundle(b *Bundle) error {
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tx, err := s.DB.Begin()
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if err != nil {
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return err
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}
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for installationID, signedPreKeyContainer := range b.GetSignedPreKeys() {
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signedPreKey := signedPreKeyContainer.GetSignedPreKey()
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version := signedPreKeyContainer.GetVersion()
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insertStmt, err := tx.Prepare(`INSERT INTO bundles(identity, signed_pre_key, installation_id, version, timestamp)
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VALUES( ?, ?, ?, ?, ?)`)
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if err != nil {
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return err
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}
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defer insertStmt.Close()
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_, err = insertStmt.Exec(
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b.GetIdentity(),
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signedPreKey,
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installationID,
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version,
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b.GetTimestamp(),
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)
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if err != nil {
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_ = tx.Rollback()
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return err
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}
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// Mark old bundles as expired
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updateStmt, err := tx.Prepare(`UPDATE bundles
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SET expired = 1
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WHERE identity = ? AND installation_id = ? AND version < ?`)
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if err != nil {
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return err
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}
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defer updateStmt.Close()
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_, err = updateStmt.Exec(
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b.GetIdentity(),
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installationID,
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version,
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)
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if err != nil {
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_ = tx.Rollback()
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return err
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}
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}
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return tx.Commit()
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}
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// GetAnyPrivateBundle retrieves any bundle from the database containing a private key
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func (s *sqlitePersistence) GetAnyPrivateBundle(myIdentityKey []byte, installations []*multidevice.Installation) (*BundleContainer, error) {
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versions := make(map[string]uint32)
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/* #nosec */
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statement := `SELECT identity, private_key, signed_pre_key, installation_id, timestamp, version
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FROM bundles
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WHERE expired = 0 AND identity = ? AND installation_id IN (?` + strings.Repeat(",?", len(installations)-1) + ")"
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stmt, err := s.DB.Prepare(statement)
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if err != nil {
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return nil, err
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}
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defer stmt.Close()
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var timestamp int64
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var identity []byte
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var privateKey []byte
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var version uint32
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args := make([]interface{}, len(installations)+1)
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args[0] = myIdentityKey
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for i, installation := range installations {
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// Lookup up map for versions
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versions[installation.ID] = installation.Version
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args[i+1] = installation.ID
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}
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rows, err := stmt.Query(args...)
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rowCount := 0
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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bundle := &Bundle{
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SignedPreKeys: make(map[string]*SignedPreKey),
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}
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bundleContainer := &BundleContainer{
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Bundle: bundle,
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}
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for rows.Next() {
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var signedPreKey []byte
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var installationID string
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rowCount++
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err = rows.Scan(
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&identity,
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&privateKey,
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&signedPreKey,
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&installationID,
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×tamp,
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&version,
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)
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if err != nil {
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return nil, err
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}
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// If there is a private key, we set the timestamp of the bundle container
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if privateKey != nil {
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bundle.Timestamp = timestamp
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}
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bundle.SignedPreKeys[installationID] = &SignedPreKey{
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SignedPreKey: signedPreKey,
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Version: version,
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ProtocolVersion: versions[installationID],
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}
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bundle.Identity = identity
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}
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// If no records are found or no record with private key, return nil
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if rowCount == 0 || bundleContainer.GetBundle().Timestamp == 0 {
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return nil, nil
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}
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return bundleContainer, nil
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}
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// GetPrivateKeyBundle retrieves a private key for a bundle from the database
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func (s *sqlitePersistence) GetPrivateKeyBundle(bundleID []byte) ([]byte, error) {
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stmt, err := s.DB.Prepare(`SELECT private_key
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FROM bundles
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WHERE signed_pre_key = ? LIMIT 1`)
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if err != nil {
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return nil, err
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}
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defer stmt.Close()
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var privateKey []byte
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err = stmt.QueryRow(bundleID).Scan(&privateKey)
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switch err {
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case sql.ErrNoRows:
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return nil, nil
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case nil:
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return privateKey, nil
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default:
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return nil, err
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}
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}
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// MarkBundleExpired expires any private bundle for a given identity
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func (s *sqlitePersistence) MarkBundleExpired(identity []byte) error {
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stmt, err := s.DB.Prepare(`UPDATE bundles
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SET expired = 1
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WHERE identity = ? AND private_key IS NOT NULL`)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec(identity)
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return err
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}
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// GetPublicBundle retrieves an existing Bundle for the specified public key from the database
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func (s *sqlitePersistence) GetPublicBundle(publicKey *ecdsa.PublicKey, installations []*multidevice.Installation) (*Bundle, error) {
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if len(installations) == 0 {
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return nil, nil
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}
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versions := make(map[string]uint32)
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identity := crypto.CompressPubkey(publicKey)
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/* #nosec */
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statement := `SELECT signed_pre_key,installation_id, version
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FROM bundles
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WHERE expired = 0 AND identity = ? AND installation_id IN (?` + strings.Repeat(",?", len(installations)-1) + `)
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ORDER BY version DESC`
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stmt, err := s.DB.Prepare(statement)
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if err != nil {
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return nil, err
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}
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defer stmt.Close()
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args := make([]interface{}, len(installations)+1)
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args[0] = identity
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for i, installation := range installations {
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// Lookup up map for versions
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versions[installation.ID] = installation.Version
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args[i+1] = installation.ID
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}
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rows, err := stmt.Query(args...)
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rowCount := 0
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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bundle := &Bundle{
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Identity: identity,
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SignedPreKeys: make(map[string]*SignedPreKey),
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}
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for rows.Next() {
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var signedPreKey []byte
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var installationID string
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var version uint32
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rowCount++
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err = rows.Scan(
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&signedPreKey,
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&installationID,
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&version,
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)
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if err != nil {
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return nil, err
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}
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bundle.SignedPreKeys[installationID] = &SignedPreKey{
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SignedPreKey: signedPreKey,
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Version: version,
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ProtocolVersion: versions[installationID],
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}
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}
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if rowCount == 0 {
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return nil, nil
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}
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return bundle, nil
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}
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// AddRatchetInfo persists the specified ratchet info into the database
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func (s *sqlitePersistence) AddRatchetInfo(key []byte, identity []byte, bundleID []byte, ephemeralKey []byte, installationID string) error {
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stmt, err := s.DB.Prepare(`INSERT INTO ratchet_info_v2(symmetric_key, identity, bundle_id, ephemeral_key, installation_id)
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VALUES(?, ?, ?, ?, ?)`)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec(
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key,
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identity,
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bundleID,
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ephemeralKey,
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installationID,
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)
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return err
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}
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// GetRatchetInfo retrieves the existing RatchetInfo for a specified bundle ID and interlocutor public key from the database
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func (s *sqlitePersistence) GetRatchetInfo(bundleID []byte, theirIdentity []byte, installationID string) (*RatchetInfo, error) {
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stmt, err := s.DB.Prepare(`SELECT ratchet_info_v2.identity, ratchet_info_v2.symmetric_key, bundles.private_key, bundles.signed_pre_key, ratchet_info_v2.ephemeral_key, ratchet_info_v2.installation_id
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FROM ratchet_info_v2 JOIN bundles ON bundle_id = signed_pre_key
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WHERE ratchet_info_v2.identity = ? AND ratchet_info_v2.installation_id = ? AND bundle_id = ?
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LIMIT 1`)
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if err != nil {
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return nil, err
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}
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defer stmt.Close()
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ratchetInfo := &RatchetInfo{
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BundleID: bundleID,
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}
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err = stmt.QueryRow(theirIdentity, installationID, bundleID).Scan(
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&ratchetInfo.Identity,
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&ratchetInfo.Sk,
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&ratchetInfo.PrivateKey,
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&ratchetInfo.PublicKey,
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&ratchetInfo.EphemeralKey,
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&ratchetInfo.InstallationID,
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)
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switch err {
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case sql.ErrNoRows:
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return nil, nil
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case nil:
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ratchetInfo.ID = append(bundleID, []byte(ratchetInfo.InstallationID)...)
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return ratchetInfo, nil
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default:
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return nil, err
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}
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}
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// GetAnyRatchetInfo retrieves any existing RatchetInfo for a specified interlocutor public key from the database
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func (s *sqlitePersistence) GetAnyRatchetInfo(identity []byte, installationID string) (*RatchetInfo, error) {
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stmt, err := s.DB.Prepare(`SELECT symmetric_key, bundles.private_key, signed_pre_key, bundle_id, ephemeral_key
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FROM ratchet_info_v2 JOIN bundles ON bundle_id = signed_pre_key
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WHERE expired = 0 AND ratchet_info_v2.identity = ? AND ratchet_info_v2.installation_id = ?
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LIMIT 1`)
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if err != nil {
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return nil, err
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}
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defer stmt.Close()
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ratchetInfo := &RatchetInfo{
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Identity: identity,
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InstallationID: installationID,
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}
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err = stmt.QueryRow(identity, installationID).Scan(
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&ratchetInfo.Sk,
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&ratchetInfo.PrivateKey,
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&ratchetInfo.PublicKey,
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&ratchetInfo.BundleID,
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&ratchetInfo.EphemeralKey,
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)
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switch err {
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case sql.ErrNoRows:
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return nil, nil
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case nil:
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ratchetInfo.ID = append(ratchetInfo.BundleID, []byte(installationID)...)
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return ratchetInfo, nil
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default:
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return nil, err
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}
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}
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// RatchetInfoConfirmed clears the ephemeral key in the RatchetInfo
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// associated with the specified bundle ID and interlocutor identity public key
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func (s *sqlitePersistence) RatchetInfoConfirmed(bundleID []byte, theirIdentity []byte, installationID string) error {
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stmt, err := s.DB.Prepare(`UPDATE ratchet_info_v2
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SET ephemeral_key = NULL
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WHERE identity = ? AND bundle_id = ? AND installation_id = ?`)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec(
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theirIdentity,
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bundleID,
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installationID,
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)
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return err
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}
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type sqliteKeysStorage struct {
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db *sql.DB
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}
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func newSQLiteKeysStorage(db *sql.DB) *sqliteKeysStorage {
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return &sqliteKeysStorage{
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db: db,
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}
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}
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// Get retrieves the message key for a specified public key and message number
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func (s *sqliteKeysStorage) Get(pubKey dr.Key, msgNum uint) (dr.Key, bool, error) {
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var key []byte
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stmt, err := s.db.Prepare(`SELECT message_key
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FROM keys
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WHERE public_key = ? AND msg_num = ?
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LIMIT 1`)
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if err != nil {
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return key, false, err
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}
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defer stmt.Close()
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err = stmt.QueryRow(pubKey, msgNum).Scan(&key)
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switch err {
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case sql.ErrNoRows:
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return key, false, nil
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case nil:
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return key, true, nil
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default:
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return key, false, err
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}
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}
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// Put stores a key with the specified public key, message number and message key
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func (s *sqliteKeysStorage) Put(sessionID []byte, pubKey dr.Key, msgNum uint, mk dr.Key, seqNum uint) error {
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stmt, err := s.db.Prepare(`INSERT INTO keys(session_id, public_key, msg_num, message_key, seq_num)
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VALUES(?, ?, ?, ?, ?)`)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec(
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sessionID,
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pubKey,
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msgNum,
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mk,
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seqNum,
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)
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return err
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}
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// DeleteOldMks caps remove any key < seq_num, included
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func (s *sqliteKeysStorage) DeleteOldMks(sessionID []byte, deleteUntil uint) error {
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stmt, err := s.db.Prepare(`DELETE FROM keys
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WHERE session_id = ? AND seq_num <= ?`)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec(
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sessionID,
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deleteUntil,
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)
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return err
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}
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|
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// TruncateMks caps the number of keys to maxKeysPerSession deleting them in FIFO fashion
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func (s *sqliteKeysStorage) TruncateMks(sessionID []byte, maxKeysPerSession int) error {
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stmt, err := s.db.Prepare(`DELETE FROM keys
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WHERE rowid IN (SELECT rowid FROM keys WHERE session_id = ? ORDER BY seq_num DESC LIMIT ? OFFSET ?)`)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec(
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sessionID,
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// We LIMIT to the max number of rows here, as OFFSET can't be used without a LIMIT
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maxNumberOfRows,
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maxKeysPerSession,
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)
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return err
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}
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|
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// DeleteMk deletes the key with the specified public key and message key
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func (s *sqliteKeysStorage) DeleteMk(pubKey dr.Key, msgNum uint) error {
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stmt, err := s.db.Prepare(`DELETE FROM keys
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WHERE public_key = ? AND msg_num = ?`)
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if err != nil {
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return err
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}
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defer stmt.Close()
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_, err = stmt.Exec(
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pubKey,
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msgNum,
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)
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return err
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}
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|
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// Count returns the count of keys with the specified public key
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func (s *sqliteKeysStorage) Count(pubKey dr.Key) (uint, error) {
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stmt, err := s.db.Prepare(`SELECT COUNT(1)
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FROM keys
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WHERE public_key = ?`)
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if err != nil {
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return 0, err
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}
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defer stmt.Close()
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|
|
var count uint
|
|
err = stmt.QueryRow(pubKey).Scan(&count)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
return count, nil
|
|
}
|
|
|
|
// CountAll returns the count of keys with the specified public key
|
|
func (s *sqliteKeysStorage) CountAll() (uint, error) {
|
|
stmt, err := s.db.Prepare(`SELECT COUNT(1)
|
|
FROM keys`)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
defer stmt.Close()
|
|
|
|
var count uint
|
|
err = stmt.QueryRow().Scan(&count)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
return count, nil
|
|
}
|
|
|
|
// All returns nil
|
|
func (s *sqliteKeysStorage) All() (map[string]map[uint]dr.Key, error) {
|
|
return nil, nil
|
|
}
|
|
|
|
type sqliteSessionStorage struct {
|
|
db *sql.DB
|
|
}
|
|
|
|
func newSQLiteSessionStorage(db *sql.DB) *sqliteSessionStorage {
|
|
return &sqliteSessionStorage{
|
|
db: db,
|
|
}
|
|
}
|
|
|
|
// Save persists the specified double ratchet state
|
|
func (s *sqliteSessionStorage) Save(id []byte, state *dr.State) error {
|
|
dhr := state.DHr
|
|
dhs := state.DHs
|
|
dhsPublic := dhs.PublicKey()
|
|
dhsPrivate := dhs.PrivateKey()
|
|
pn := state.PN
|
|
step := state.Step
|
|
keysCount := state.KeysCount
|
|
|
|
rootChainKey := state.RootCh.CK
|
|
|
|
sendChainKey := state.SendCh.CK
|
|
sendChainN := state.SendCh.N
|
|
|
|
recvChainKey := state.RecvCh.CK
|
|
recvChainN := state.RecvCh.N
|
|
|
|
stmt, err := s.db.Prepare(`INSERT INTO sessions(id, dhr, dhs_public, dhs_private, root_chain_key, send_chain_key, send_chain_n, recv_chain_key, recv_chain_n, pn, step, keys_count)
|
|
VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer stmt.Close()
|
|
|
|
_, err = stmt.Exec(
|
|
id,
|
|
dhr,
|
|
dhsPublic,
|
|
dhsPrivate,
|
|
rootChainKey,
|
|
sendChainKey,
|
|
sendChainN,
|
|
recvChainKey,
|
|
recvChainN,
|
|
pn,
|
|
step,
|
|
keysCount,
|
|
)
|
|
|
|
return err
|
|
}
|
|
|
|
// Load retrieves the double ratchet state for a given ID
|
|
func (s *sqliteSessionStorage) Load(id []byte) (*dr.State, error) {
|
|
stmt, err := s.db.Prepare(`SELECT dhr, dhs_public, dhs_private, root_chain_key, send_chain_key, send_chain_n, recv_chain_key, recv_chain_n, pn, step, keys_count
|
|
FROM sessions
|
|
WHERE id = ?`)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
defer stmt.Close()
|
|
|
|
var (
|
|
dhr []byte
|
|
dhsPublic []byte
|
|
dhsPrivate []byte
|
|
rootChainKey []byte
|
|
sendChainKey []byte
|
|
sendChainN uint
|
|
recvChainKey []byte
|
|
recvChainN uint
|
|
pn uint
|
|
step uint
|
|
keysCount uint
|
|
)
|
|
|
|
err = stmt.QueryRow(id).Scan(
|
|
&dhr,
|
|
&dhsPublic,
|
|
&dhsPrivate,
|
|
&rootChainKey,
|
|
&sendChainKey,
|
|
&sendChainN,
|
|
&recvChainKey,
|
|
&recvChainN,
|
|
&pn,
|
|
&step,
|
|
&keysCount,
|
|
)
|
|
switch err {
|
|
case sql.ErrNoRows:
|
|
return nil, nil
|
|
case nil:
|
|
state := dr.DefaultState(rootChainKey)
|
|
|
|
state.PN = uint32(pn)
|
|
state.Step = step
|
|
state.KeysCount = keysCount
|
|
|
|
state.DHs = crypto.DHPair{
|
|
PrvKey: dhsPrivate,
|
|
PubKey: dhsPublic,
|
|
}
|
|
|
|
state.DHr = dhr
|
|
|
|
state.SendCh.CK = sendChainKey
|
|
state.SendCh.N = uint32(sendChainN)
|
|
|
|
state.RecvCh.CK = recvChainKey
|
|
state.RecvCh.N = uint32(recvChainN)
|
|
|
|
return &state, nil
|
|
default:
|
|
return nil, err
|
|
}
|
|
}
|